Yesh, it's my cat (well more like I'm HER human than she is MY cat really especially from her point of view)
Anyways yeah, some have the temperament to walk on a leash and if you teach them since kittens almost every cat.
No dogs where I walk her though. Since the park is practically my yard by my place dogs don't go near and you see them leashed across the street so we don't go there. (although it's not a dog park)
Anyways aside the fact that we ought to keep in mind to keep our leashed kitties away from doggy areas for their safety it's a very cute and fun thing to do as long as your kitteh enjoys it.

P.S. And if you think that's cute and unusual once I saw a chinchilla in a harness!!!! I was and the little guy was smarter of what I thought and came when called, etc. It took me a while to figure if it was a bunny, cat, bunny cat, or anime-like-mythical-creature